TM 5-4320-302-146-18. CRANKSHAFT ASSEMBLY (CONT)Location/ItemActionRemarksc.However, if the crankpins are evenly worn,not out-of-round, and the crankshaft journaldiameters are within specified limits, the con-dition may be rectified by replacing con-necting rod big-end bearings. Replace thebig-end bearings in accordance with paragraph6-17. Check the big-end bearing radial clear-ance. If it exceeds the tolerance limits of0.0020 to 0.0118 inch (0.05 to 0.3 mm), thecrankshaft must be replaced.d.If the measurements at points 1 and 2 differby more than 0.0028 inch (0.07 mm) and/orone set is outside the tolerance limits, thecrankpin is worn into a conical shape and thecrankshaft must be replaced. If the measure-ments along axis A and B differ by more than0.0028 inch (0.07 mm) and/or one set is out-side the tolerance limits, the crankpin is worninto an oval shape and the crankshaft must bereplaced. For both these out-of-round condi-tions, also check connecting rods, pistons, andcylinders for unusual wear.e.The crankpin width at point 3 should be1.3386 to 1.3401 inches (34.0 to 34.039 mm).The fillet radius measurement should be 0.1693to 0.1772 inch (4.30 to 4.50 mm). If eithermeasurement is outside the specified limits, thecrankshaft must be replaced.9.ReplacementIf the crankshaft must be replaced, the followingcrankshaftcrankpin diameter normal and undersizes arecrankpinsavailable:6-145
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